Crash using knife tool on mesh with large number of vertices #55946

New Issue

Kenneth D · 2018-07-12T07:26:13+02:00

Kenneth D commented

2018-07-12 07:26:13 +02:00

System Information
Win 10
16GB Ram
GTX 980
Intel i7-5930K

Blender Version
Broken: 2.80 alpha 2018-07-11 21:13 build: d28d202 (July 12th daily)

Short description of error
Blender crashes when trying to use knife tool on a model with a large number of vertices.
My real world model has 260,513 vertices (CT scan)

Exact steps for others to reproduce the error
Open new blender session,
Delete existing cube
Add One Icosphere
Set subdivisions to 8 or 9
enter edit mode
deselect all
hit k for knife tool
draw line from one vertex across several edges
click to set other end of line
crash.

**System Information** Win 10 16GB Ram GTX 980 Intel i7-5930K **Blender Version** Broken: 2.80 alpha 2018-07-11 21:13 build: d28d202 (July 12th daily) **Short description of error** Blender crashes when trying to use knife tool on a model with a large number of vertices. My real world model has 260,513 vertices (CT scan) **Exact steps for others to reproduce the error** Open new blender session, Delete existing cube Add One Icosphere Set subdivisions to 8 or 9 enter edit mode deselect all hit k for knife tool draw line from one vertex across several edges click to set other end of line crash.

Kenneth D commented

2018-07-12 07:26:13 +02:00

Added subscriber: @CyanBC

Jesse Yurkovich commented

2018-07-14 02:36:29 +02:00

Added subscriber: @deadpin

Jesse Yurkovich commented

2018-07-14 02:36:29 +02:00

Confirmed here as well on a somewhat smaller mesh -- monkey head subdivided to level 4 and applied (126,290 verts)

The issue is most likely due to a problem more easily spotted with debug builds: Assertion failure.

#if TRUST_NO_ONE
	assert(bytes_needed <= IMM_BUFFER_SIZE);
#endif

In my case bytes_needed is 5167152 but IMM_BUFFER_SIZE is a static 4194304. If I use a IcoSphere subdivided to level 8, we'd need 11+ megs for this buffer...

Occurs at:

blender.exe!immBegin(Gwn_PrimType prim_type, unsigned int vertex_len) Line 192	C
blender.exe!immBeginAtMost(Gwn_PrimType prim_type, unsigned int vertex_len) Line 252	C
blender.exe!knifetool_draw(const bContext * UNUSED_C, ARegion * UNUSED_ar, void * arg) Line 1162	C
blender.exe!ED_region_draw_cb_draw(const bContext * C, ARegion * ar, int type) Line 276	C
blender.exe!DRW_draw_render_loop_ex(Depsgraph * depsgraph, RenderEngineType * engine_type, ARegion * ar, View3D * v3d, GPUViewport * viewport, const bContext * evil_C) Line 1432	C
blender.exe!DRW_draw_view(const bContext * C) Line 1316	C

Confirmed here as well on a somewhat smaller mesh -- monkey head subdivided to level 4 and applied (126,290 verts) The issue is most likely due to a problem more easily spotted with debug builds: Assertion failure. ``` #if TRUST_NO_ONE assert(bytes_needed <= IMM_BUFFER_SIZE); #endif ``` In my case `bytes_needed` is 5167152 but `IMM_BUFFER_SIZE` is a static 4194304. If I use a IcoSphere subdivided to level 8, we'd need 11+ megs for this buffer... Occurs at: ``` blender.exe!immBegin(Gwn_PrimType prim_type, unsigned int vertex_len) Line 192 C blender.exe!immBeginAtMost(Gwn_PrimType prim_type, unsigned int vertex_len) Line 252 C blender.exe!knifetool_draw(const bContext * UNUSED_C, ARegion * UNUSED_ar, void * arg) Line 1162 C blender.exe!ED_region_draw_cb_draw(const bContext * C, ARegion * ar, int type) Line 276 C blender.exe!DRW_draw_render_loop_ex(Depsgraph * depsgraph, RenderEngineType * engine_type, ARegion * ar, View3D * v3d, GPUViewport * viewport, const bContext * evil_C) Line 1432 C blender.exe!DRW_draw_view(const bContext * C) Line 1316 C ```

Bastien Montagne commented

2018-07-25 15:23:52 +02:00

Added subscribers: @fclem, @Jeroen-Bakker, @mont29